Telephone apparatus, telephone switchboard, and telephone line connection method

摘要

The telephone apparatus prevents a ringer sound from being produced from a handset after the handset is off-hook by an incoming call while using a conventional subscriber line of a central telephone exchange. A telephone apparatus includes a ringer signal detection unit that detects a ringer signal, and a disconnection unit that disconnects a loudspeaker from a line while the ringer signal detection unit detects the ringer signal.